The list below will allow you to quickly see the most popular book promo sites that offer a free level of service.

Founder
Dave Chesson
When I am not fighting dragons or chasing the bogey man out of my kids' closet, I like using my previous Online Optimization skills to help other authors with the 'technical' stuff and get the right authors to the top of Amazon and any other eBook service out there.
Thanks for the list. I would love to know which sites are particularly useful for juvenile fiction. It’s so hard for children’s authors to reach our audience.
I haven’t tried genre specific examples through them so I can’t say, if and how much of a factor that would be.